The blaring vocals by Idina Menzel were picked up by his table microphone, spurring scores of attendees to chuckle and Vilsack to crack a smile, as seen in videos posted by CNBC a NBC News' House of Representatives producer.

"Ah, come on," a visibly embarrassed Roberts said.

"Just let it go, mister," the 78-year-old added as he silenced his phone. "Sorry about that."

A senator?s cell phone just rang to the tune of Disney?s ?Let It Go? during a hearing. The reaction was priceless.
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